It’s not clear from your post whether your DH still goes to his mum’s, or whether he stays at home with you now. I hope it’s the latter.
I’m a bit torn, because when the children were young, family Christmas was such hard work that I was generally grateful to anyone who would take on tasks like making the dinner. I probably could even have put up with your MIL. However she sounds so overbearing that I can also see that it would very quickly start to grate.
For many years now, I’ve cooked the dinner, though my young adult children are now old enough to help, and having bought them stockings each year with small presents in, they now make one for me, which is lovely.
Other than that, I love having lots of Christmas decorations and lights and especially candles.
There will be a change this year, because for the first time in many years, I will be going to my parents, so I’m quite excited to be doing something different, though I may have to take over the kitchen, which will be fine, now I no longer have young children.